public void InsertMusicSheet(MusicSheet sheet)
 {
     var msc = new MusicSheetController();
     msc.InsertMusicSheet(sheet);
 }
 public MusicSheet GetMusicSheet(string friendlyId)
 {
     var msc = new MusicSheetController();
     return msc.GetMusicSheetByFriendlyId(friendlyId);
 }